CAJ | 학술논문

光纤传感是现代光纤技术的重要应用之一。制作了一种基于两个单模光纤粗锥串接的全光纤型马赫-曾德尔高温高灵敏温度传感器。纤芯中传输的光通过第一个光纤锥耦合，一部分进入纤芯传输，另一部分进入包层形成包层模，纤芯模和包层模具有不同的有效折射率，经过干涉臂的传输产生了光程差。纤芯和包层传输的光再经过第二个光纤锥耦合，形成干涉进入输出光纤传输。对不同长度的传感器进行实验研究，得出传感臂长度与干涉周期之间的关系。研究了传感器温度响应特性，给出了温度响应灵敏度。实验结果表明，在30～400℃温度范围内，长度为35 mm的传感器可以得到较高的温度响应灵敏度，其响应灵敏度为0．115 nm·℃-1。利用傅里叶变换对传感器透射谱进行了分析，可以确定在长度为35 mm的传感器中仅有基模LP01和高阶模LP08两种模式，透射谱就是由这两种模式干涉形成的。该传感器体积小、精度高、抗电磁干扰，具有易于制作、对比度大、质轻、灵敏度高、耐高温等优点。可用于高温气体温度测量及油气井测井等领域的高灵敏度温度传感测量。
광섬전감시현대광섬기술적중요응용지일。제작료일충기우량개단모광섬조추천접적전광섬형마혁-증덕이고온고령민온도전감기。섬심중전수적광통과제일개광섬추우합，일부분진입섬심전수，령일부분진입포층형성포층모，섬심모화포층모구유불동적유효절사솔，경과간섭비적전수산생료광정차。섬심화포층전수적광재경과제이개광섬추우합，형성간섭진입수출광섬전수。대불동장도적전감기진행실험연구，득출전감비장도여간섭주기지간적관계。연구료전감기온도향응특성，급출료온도향응령민도。실험결과표명，재30～400℃온도범위내，장도위35 mm적전감기가이득도교고적온도향응령민도，기향응령민도위0．115 nm·℃-1。이용부리협변환대전감기투사보진행료분석，가이학정재장도위35 mm적전감기중부유기모LP01화고계모LP08량충모식，투사보취시유저량충모식간섭형성적。해전감기체적소、정도고、항전자간우，구유역우제작、대비도대、질경、령민도고、내고온등우점。가용우고온기체온도측량급유기정측정등영역적고령민도온도전감측량。
Optical fiber sensing technology is one of the very promising techniques in sensing fields.A high sensitivity high tem-perature sensor based on inline optical fiber Mach-Zehnder(M-Z)interferometer by using standard single mode fiber with two waist-enlarged bitapers is proposed in the present paper.The waist-enlarged bitapers are considered as couplers,the distance be-tween the two bitapers is the sensing arm.The light in the lead-in fiber core couples into the sensing arms’fiber core and clad-ding by the first bitaper,and then propagate in them.The phase difference between core mode and cladding mode is produced when the light reaches the second bitaper.Then the second bitaper couples the light into the lead-out single-mode fiber to get the interference spectrum.The sensors with different length were fabricated.The relationship between the sensor length and inter-ference period,and the temperature response of the sensor were studied by experiments.The results show that the 35 mm long sensor has a high sensitivity of 0. 115 nm·℃-1 in the range of 30~400 ℃.The transmission spectrum of the sensor was also analyzed by the fast Fourier transform.It shows that only LP01 mode and LP08 mode propagate in the sensor.The sensor has ad-vantages of small size,high precision,and immunity to electromagnetic inteference.In addition,it is of easy fabrication,high signal-to-noise ratio,light weight,and high sensitivity,and could be operated under high temperature.This kind of sensor is a good candidate for high temperature measurement of hot gas,oil and gas well logging and other areas.